Wrench.



No. 703,230. Patented June 24, I902.

G. H. BOYD.

WRENCH.

(Application filed on. as, 1901 (No Model.)

' UNITED STATES PATENT OFFICE.

GEORGE H. BOYD, OF WVOROESTER, MASSACHUSETTS.

WRENCH.

SPECIFICATION forming part of Letters Patent No. '703,230, dated June24, 1902.

Application filed October 29, 1901. Serlal No. 80,425. (No model.)

To (0Z5 whom it may concern.-

Be it known that I, GEORGE H. BOYD, a citizen of the United States,residing at Worcester, in the county of Worcester and State ofMassachusetts, have invented a new and useful Improvement in WVrenches,of which the following, together with the accompanying drawings, is aspecification sufficiently full, clear, and exact to enable personsskilled in the art to which this invention appertains to make and usethe same.

My present invention relates to the con struction of the sliding jaw ofa Goes or similar screw-wrench, the objects being to enhance thestrength and efiiciency of the wrench and to provide in a wrench of theclass illustrated a movable jaw having an integrally-attached hard-metalor steel wearresisting plate covering the face of the jaw and extendingaround the bar-opening for reinforcing the jaw-supporting strap, as morefully hereinafter explained. I attain these objects by the constructionillustrated in the drawings, whereim- Figure 1 represents a side view ofa wrench with a sliding jaw embodying my improvement. Fig. 2 isavertical section at line X X. Fig. 3 is a plan view of the top of thejaw; and Fig. 4 a side view of the jaw, showing a modification.

The nature of my invention consists in applying to the upper part of thejaw-body and its supporting-strap in a sliding or movable wrench-jaw,which is commonly made of cast malleable iron, a plate or reinforcefacing of hard steel or equivalent material arranged for covering thejaw face and extending around the bar-space opening, and thenpermanently or solidly uniting such facing-plate to the body metal bybrazing or welding the adjacent surfaces integrally together, so thatthe steel jaw-facing constitutes a permanent reinforce for preventingrupture of the upperjaw-supporting strap at the angles of the opening.

In the drawings, A indicates the wrenchbar, having the usual fixed jawa, and B indicates the improved sliding jaw, composed of the bodyportion 2, which is preferably made of cast malleable iron, togetherwith the integral supporting and guiding straps 3 and 4: and thehard-steel plate 5, fitting upon the top end of the body and extendingover the strap 3 along the sides 9 and across the back, as at 6,completely around the opening 7, through which the bar A passes. Theplate 5 and body2 are permanentlyintegrated or affixed to each other bybrazing or welding together their adjacent surfaces on the line ofcontact 10, thereby forming an inseparable solid wear-resisting face anda strengthening-reinforce that is unitary with and prevents the strap8from breaking at the corners and from stretching and causing increasedlooseness upon the bar. The preferred form is a flat plate 5 of uniformthickness that can be cut from plate-steel; but if in any instancedesired the plate and jaw can be provided with interengaging lugs andnotches or dovetails 15 in the surfaces, which are brazed or weldedtogether, as indicated in Fig. 4.

The bar A, rosette-screw O, and wrench handle E may be of usual form orof any suitable construction. The outer edges of the plate 5 are bestground off flush with the sides of the strap and body of the jaw, givinga flush smooth finish.

I am aware that different varieties of wrenches have heretofore beenprovided with detachable steel jaw-faces, and it will be understood thatI do not claim steel jaw-faces in general or irrespective of theconstruction defined.

What I claim, and desire to secure by Letters Patent, is-

In a wrench of the character described, in combination with thewrench-bar having the fixed jaw and handle arranged thereon, and thejaw=adjusting screw; the slidable jaw comprising a body portion andguiding-straps made of malleable iron, and provided with a steel orhard-metal reinforce plate covering the top face and the jaw'supportingstrap surrounding said wrench-bar, said reinforceplate being permanentlyunited to the jaw body and strap, around the bar-space opening, by anintegral union of the adjacent surfaces, substantially as and for thepurposes set forth.

Witness my hand this 25th day of October, 1901.

GEORGE H. BOYD.

Witnesses 2 Cells. I-I. BURLEIGH, CHARLES S. Bacon.

